Instructions
Purchase an HDMI cable for your Wii. The cable cannot be a regular HDMI cable; it must be compatible with your Wii. You can usually purchase these in any store where the Nintendo Wii console is sold.
Insert the Wii end of the HDMI cable into the back of your Wii console. There is only one slot it can fit in. Push it into the slot until the wire is secured.
Find an open HDMI slot on the rear of your Sony HDTV. Slide the other end of the video wire into the slot until the end of the wire is secure.
Set your television to the proper HDMI video input and turn on the Wii console. If it is hooked up correctly, the Wii's menu should appear on your television. If it is not, switch to another HDMI video input selection until you find the correct input.